Valves

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Category: Valvetrain

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Revision as of 10:26, 23 July 2015 ddgonzal (Talk | contribs) (->Valve Guides) <- Previous diff		Current revision ddgonzal (Talk | contribs) (->Specifications)
Line 13:		Line 13:
	= Stem Oil Seal =		= Stem Oil Seal =
-	See main article: [[Valve Seals]]	+	{{SeeMainArticle|Valve Seals|23354|THUMB}}
-	http://datsun1200.com/uploads/thumbs/23354.jpg http://datsun1200.com/uploads/thumbs/23355.jpg http://datsun1200.com/uploads/thumbs/23353.jpg	+	http://datsun1200.com/uploads/thumbs/23355.jpg http://datsun1200.com/uploads/thumbs/23353.jpg
	= Specifications =		= Specifications =
-	[http://datsun1200.com/modules/myalbum/photo.php?lid=6691 http://datsun1200.com/uploads/thumbs/6691.jpg]	+	{{Album|6691}} {{UploadH|174_57e5bd34bc9c9.jpg|353}}
		+	{{See|Cylinder_Head_Identification#Valves}}
		+
		+	[[A12]] engine valve specs
	* Intake valve head diameter: 35 mm		* Intake valve head diameter: 35 mm
	* Exhaust valve head diameter: 29 mm		* Exhaust valve head diameter: 29 mm
-	* Stem diameter: 8 mm	+	* Stem diameter: 8 mm nominal (~7.95 actual)
	* Overall length: 103.80 mm		* Overall length: 103.80 mm
	* Seat angle: 45 degrees		* Seat angle: 45 degrees
Line 33:		Line 36:
	* 13201-H2300 VALVE-INTAKE A12GX [35mm]		* 13201-H2300 VALVE-INTAKE A12GX [35mm]
	* 13202-H2300 VALVE-EXHAUST A12GX [29mm]		* 13202-H2300 VALVE-EXHAUST A12GX [29mm]
		+
		+	= Valve Seat =
		+	{{Album|4442}}
		+
		+	B110 was fitted with insert valve seats on both inlet and exhaust. Revised valve seats (circa 1972) are [[Fuel Requirements|compatible with unleaded fuel]].
		+
		+	EARLIEST taken from the A10 engine for B10 (180 prefix)
		+	11098-18011 INSERT-valve seat, intake 4 (exc. GX)
		+	11099-18010 INSERT-valve seat, exhaust 4 (exc. GX)
		+
		+	REVISED exhaust seat
		+	11099-H1010 INSERT-valve seat, exhaust 4 ALL > 11099-18010
		+
		+	NORTH AMERICA catalog
		+	11098-18011 INSERT-VALVE SEAT INTAKE (4)
		+	11098-H1012 INSERT-VALVE SEAT INTAKE (4)
		+	11099-18010 INSERT-VALVE SEAT EXHAUST (4)
		+	11099-H1010 INSERT-VALVE SEAT,EXHAUST (4) -273 < 11099-18010
	= Valve Keepers =		= Valve Keepers =
-	[http://datsun1200.com/modules/myalbum/photo.php?lid=15324 http://datsun1200.com/uploads/thumbs/15324.jpg]	+	{{Album|15324}}
	Valve Spring Retainer Keeper (Valve lock)		Valve Spring Retainer Keeper (Valve lock)
Line 53:		Line 74:
	July 1972 change		July 1972 change
-	<br>[http://datsun1200.com/modules/myalbum/photo.php?lid=24388 http://datsun1200.com/uploads/thumbs/24388.jpg]	+	<br>{{Album-|24388}}
	13209-18000 RETAINER-VALVE SPRING (8) <> 13209-H2300 <> 13209-H2301		13209-18000 RETAINER-VALVE SPRING (8) <> 13209-H2300 <> 13209-H2301
Line 64:		Line 85:
	= Valve Guides =		= Valve Guides =
-	See main article: [[Valve Guides]]	+	{{SeeMainArticle|Valve Guides|22803}}
-		+
-	http://datsun1200.com/uploads/photos/22803.jpg	+
	= Valve Springs =		= Valve Springs =
-	See main article: [[Valve springs]]	+	{{SeeMainArticle|Valve springs|504}}
		+
		+	= Valve Angles =
		+	A12 came from the factory with a 3-angle valve job. Accept no less.
		+
		+	SEATS
		+	* Intake: 75° + 45° + 22.5°
		+	max. dia. @ 45°: 34.6mm
		+	contact width = 1.3mm
		+	* Exhaust: 75° + 45°
		+	max. dia. @ 45°: 28.6mm
		+	contact width = 1.8 mm
		+
		+	VALVES
		+	* Intake 30° + 45°30' backcut
		+	* Exhaust 20° + 45°30' backcut
		+	* Minimum valve head thickness 0.5 mm
		+
		+	{{Photo-|EM-13-41.jpg}}
		+
		+	{{Photo-|EM-09-32.jpg}}
		+
		+	{{Photo-|EM-12-40.jpg}}
		+
		+	Nissan Competition recommend these angles, which are the ones commonly used by many manufacturers in recent times:
		+
		+	60° + 45° + 30°
		+
		+	The seat width is a compromise between good flow (narrow width) and good heat transfer (wide seat). So exhaust valves need a wider seat contact area. And so do hotter engines. The factory values are what Nissan Competition recommended (although at times the recommendation varied).
		+
		+	The factory used a 45°30' cut on the seat and a plain 45 on the valve. The slight difference between seat angle and valve angle is called '''interference angle''' and helps with initial fit. It may also help with longevity.
		+
		+	Reportedly there is no turbulence if the angles are kept to 15 degrees or less. So the best is the 5-angle:
		+
		+	[90 to] 75 + 60 + 45 + 30 + 15 [to 0]
		+
		+	The downside is extra labor. And the 3-angle gains a lot over a 1-angle job, so except for racing, very few do a 5-angle (Honda and Mitsibushi have reportedly done them on production cars).
		+
		+	{{UploadPost|174_57b2eaf2f2c0f.jpg|480566}}
		+
		+	= Nissan Competition =
		+	[[1984_Nissan_Competition_Catalog#Cylinder_Head.2C_Valves_and_Lubrication|1984 Nissan Competition Catalog]]
		+	<br>{{PhotoTh!|Competition198438.jpg|Datsun%201200/wiki/competition}}
-	http://datsun1200.com/uploads/thumbs/504.jpg	+	VALVES (A-SERIES)
		+	4 of each required
		+	* 13201-H2300 35MM/1.38" INTAKE VALVE A12, A12GX
		+	* 13201-H6200 37MM/1.46" INTAKE VALVE A14, A15
		+	* 99996-H1100 COMPETITION 37MM/1.46" INTAKE VALVE
		+	Polished and tuliped for improved flow
		+	characteristics
		+	* 13202-H2300 29MM/1.14" EXHAUST VALVE A12, A12GX
		+	* 13202-H6200 30MM/1.18" EXHAUST VALVE A14, A15
		+	* 99996-H1110 COMPETITION 30MM/1.18" EXHAUST VALVE
		+	Polished and tuliped for improved flow
		+	characteristics
	= Others =		= Others =
Line 79:		Line 151:
	* [[Big Valves]]		* [[Big Valves]]
-	[[Category:Valvetrain]]	+	[[Category:Valvetrain]]{{End}}

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Current revision

Datsun 1200 uses traditional 8mm stem diameter poppet valves.

Contents 1 Maintenance 2 Removal & Installation 3 Stem Oil Seal 4 Specifications 5 Part Numbers 6 Valve Seat 7 Valve Keepers 8 Valve Guides 9 Valve Springs 10 Valve Angles 11 Nissan Competition 12 Others

Maintenance

See main article: Valve adjustment

Removal & Installation

1. Remove the Cylinder Head
2. Compress the valve springs and remove the keepers, then the springs
3. Slide valve out of the head
4. Coat valve mating surface with grinding compound. Slide new valve in and lap the valve. Clean the compound off.
5. If needed, remove old seals and put new seals on
6. Re-fit the valve springs

Stem Oil Seal

Specifications

Album 6691 Upload click to view

A12 engine valve specs
* Intake valve head diameter: 35 mm
* Exhaust valve head diameter: 29 mm
* Stem diameter: 8 mm nominal (~7.95 actual)
* Overall length: 103.80 mm
* Seat angle: 45 degrees
* Head style: standard
* Stem end: NG

Part Numbers

* 13201-H1000 VALVE-INTAKE [35mm] 
* 13202-18000 VALVE-EXHAUST [29mm]
* 13201-H2300 VALVE-INTAKE A12GX [35mm] 
* 13202-H2300 VALVE-EXHAUST A12GX [29mm]

Valve Seat

Album 4442

B110 was fitted with insert valve seats on both inlet and exhaust. Revised valve seats (circa 1972) are compatible with unleaded fuel.

EARLIEST taken from the A10 engine for B10 (180 prefix)
11098-18011 INSERT-valve seat, intake 4 (exc. GX)
11099-18010 INSERT-valve seat, exhaust 4 (exc. GX)

REVISED exhaust seat
11099-H1010 INSERT-valve seat, exhaust 4 ALL > 11099-18010

NORTH AMERICA catalog
11098-18011 INSERT-VALVE SEAT INTAKE (4)
11098-H1012 INSERT-VALVE SEAT INTAKE (4)
11099-18010 INSERT-VALVE SEAT EXHAUST (4)
11099-H1010 INSERT-VALVE SEAT,EXHAUST (4) -273 < 11099-18010

Valve Keepers

Album 15324

Valve Spring Retainer Keeper (Valve lock)
* Stem diameter 0.252
* 7 degree angle
* SEALED POWER Part # VK215
* BECK/ARNLEY Part # 0230045

Interchange
* 1976-1979 Buick Opel/Isuzu 1.8
* 1976-1978 Chevrolet Luv/Isuzu 1.8
* 1981-1995 Isuzu, various models
* 1988-1996 Honda/Isuzu 2.6
* Datsun A-series
* Datsun L-series 4 and 6
* Datsun Z-series

July 1972 change
Album 24388

13209-18000 RETAINER-VALVE SPRING (8) <> 13209-H2300 <>  13209-H2301 
13209-H2302 RETAINER-VALVE SPRING (8) 0772- [without O-ring grooves]
13209-H2302 RETAINER-VALVE SPRING (8) B210

13210-73400 COLLET-VALVE 1 (16) A12 (MATERIAL C40) < 13210-U0100
13210-H1000 COLLET-VALVE 1 (16) A12 0272- <> 13210-U0100
13210-U0100 COLLET-VALVE (MATERIAL C1010) B210 > 13210-73400 $1.13 USD

Valve Guides

Valve Springs

Valve Angles

A12 came from the factory with a 3-angle valve job. Accept no less.

SEATS

* Intake: 75° + 45° + 22.5°
  max. dia. @ 45°: 34.6mm
  contact width = 1.3mm
* Exhaust: 75° + 45°
  max. dia. @ 45°: 28.6mm
  contact width = 1.8 mm

VALVES
* Intake 30° + 45°30' backcut
* Exhaust 20° + 45°30' backcut
* Minimum valve head thickness 0.5 mm

Nissan Competition recommend these angles, which are the ones commonly used by many manufacturers in recent times:

60° + 45° + 30°

The seat width is a compromise between good flow (narrow width) and good heat transfer (wide seat). So exhaust valves need a wider seat contact area. And so do hotter engines. The factory values are what Nissan Competition recommended (although at times the recommendation varied).

The factory used a 45°30' cut on the seat and a plain 45 on the valve. The slight difference between seat angle and valve angle is called interference angle and helps with initial fit. It may also help with longevity.

Reportedly there is no turbulence if the angles are kept to 15 degrees or less. So the best is the 5-angle:

[90 to] 75 + 60 + 45 + 30 + 15 [to 0]

The downside is extra labor. And the 3-angle gains a lot over a 1-angle job, so except for racing, very few do a 5-angle (Honda and Mitsibushi have reportedly done them on production cars).

Post 480566

Nissan Competition

1984 Nissan Competition Catalog

VALVES (A-SERIES)
4 of each required
* 13201-H2300 35MM/1.38" INTAKE VALVE A12, A12GX 
* 13201-H6200 37MM/1.46" INTAKE VALVE A14, A15 
* 99996-H1100 COMPETITION 37MM/1.46" INTAKE VALVE
    Polished and tuliped for improved flow 
    characteristics
* 13202-H2300 29MM/1.14" EXHAUST VALVE A12, A12GX 
* 13202-H6200 30MM/1.18" EXHAUST VALVE A14, A15 
* 99996-H1110 COMPETITION 30MM/1.18" EXHAUST VALVE 
    Polished and tuliped for improved flow 
    characteristics

Others

For other A-series valves (A14, etc) and for competition valves, see:

* Cylinder_Head_Identification#Valves
* Big Valves 

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